correct, for both the 5.2 and 5.9, which is also the same outlet size as the passenger-side 340 center dump manifold. I just checked and the 318 is 1-3/4" outlet...but a 318 is not a huge engine....
318 above, 340 below -
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Still tho...I really wonder how much that tiny difference will 'really' make...
I just found this thread too with some additional info -
318 vs 340 exhaust manifolds
